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SUMMARY:Infrared Properties of Hot Gauge Theories
DTSTART;VALUE=DATE-TIME:19990225T110000Z
DTEND;VALUE=DATE-TIME:19990225T120000Z
DTSTAMP;VALUE=DATE-TIME:20260702T072728Z
UID:indico-event-1111@indico.ific.uv.es
DESCRIPTION:The infrared limits of the gluon polarization tensor are analy
 zed in hot non-Abelian theories using perturbative and nonperturbative cal
 culations. The calculations performed within the lowest one-loop order lea
 d to the very important result: to the infrared fictitious pole of the glu
 on propagator which spoils the selfconsistency within any perturbative sch
 eme. Within nonperturbative calculations there are two different possibili
 ties to eliminate this difficulty: the nonanalytical logarithmic behaviour
  for small momenta and the finite limit of the order of g^2 T that is the 
 so-called gluon magnetic mass. Both possibilities are analyzed. The next-t
 o-leading order calculations are reviewed to present the nonperturbative s
 creening potential within hot non-Abelian QCD and the Debye mass. The scre
 ening potential being calculating nonperturbatively does not correspond to
  the usual attractive QCD-Debye one and instead of that it is repulsive an
 d power-behaved like 1/r^6 at large distance. The more exact calculations 
 of the Debye mass are also reviewed briefly.\n\nhttps://indico.ific.uv.es/
 event/1111/
LOCATION:Dpto. de Fisica Teorica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1111/
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